Get Siberian Strike from here:
http://pdacentral.ist.utl.pt/pocket/preview/286408.html
I also found this:
"Gameloft no longer develops games for PocketPC or Palm devices. Many of the games no longer work on modern devices, and in order to maintain customer satisfaction and the rigourous quality of games that Gameloft is known for, the games have been removed from sale."
VERY strange, because I have Dell Axim X30 624MHz and actually all newer and older games (not only Gameloft's) work excellent on my device...